Finding the Fourth Proportional to 38,900.07, 53,672.61 and 21,901

Step by Step Solution

1. Step 1: Write the proportion equation
   38,900.07 : 53,672.61 = 21,901 : x
2. Step 2: Convert to fraction form
   38,900.07/53,672.61 = 21,901/x
3. Step 3: Cross multiply
   38,900.07x = 53,672.61 × 21,901
4. Step 4: Simplify right side
   38,900.07x = 1,175,483,831.61
5. Step 5: Solve for x
   x = 1,175,483,831.61/38,900.07
6. Step 6: Final answer
   x = 30,218.04